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| Titel |
An isopycnic ocean carbon cycle model |
| VerfasserIn |
K. M. Assmann, M. Bentsen, J. Segschneider, C. Heinze |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 3, no. 1 ; Nr. 3, no. 1 (2010-02-16), S.143-167 |
| Datensatznummer |
250000799
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| Publikation (Nr.) |
 copernicus.org/gmd-3-143-2010.pdf |
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| Zusammenfassung |
| The carbon cycle is a major forcing component in the global climate system.
Modelling studies, aiming to explain recent and past climatic changes and to
project future ones, increasingly include the interaction between the
physical and biogeochemical systems. Their ocean components are generally
z-coordinate models that are conceptually easy to use but that employ a
vertical coordinate that is alien to the real ocean structure. Here, we
present first results from a newly-developed isopycnic carbon cycle model and
demonstrate the viability of using an isopycnic physical component for this
purpose. As expected, the model represents well the interior ocean transport
of biogeochemical tracers and produces realistic tracer distributions.
Difficulties in employing a purely isopycnic coordinate lie mainly in the
treatment of the surface boundary layer which is often represented by a bulk
mixed layer. The most significant adjustments of the ocean biogeochemistry
model HAMOCC, for use with an isopycnic coordinate, were in the
representation of upper ocean biological production. We present a series of
sensitivity studies exploring the effect of changes in biogeochemical and
physical processes on export production and nutrient distribution. Apart from
giving us pointers for further model development, they highlight the
importance of preformed nutrient distributions in the Southern Ocean for
global nutrient distributions. The sensitivity studies show that iron
limitation for biological particle production, the treatment of light
penetration for biological production, and the role of diapycnal mixing
result in significant changes of nutrient distributions and liniting factors
of biological production. |
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